US11962202B2 - Motor and fan motor - Google Patents

Motor and fan motor Download PDF

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Publication number
US11962202B2
US11962202B2 US17/812,528 US202217812528A US11962202B2 US 11962202 B2 US11962202 B2 US 11962202B2 US 202217812528 A US202217812528 A US 202217812528A US 11962202 B2 US11962202 B2 US 11962202B2
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Prior art keywords
temperature sensor
motor
bearing
disposed
temperature
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US17/812,528
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US20230073481A1 (en
Inventor
Kouji Kebukawa
Kentaro Suzuki
Wataru NOGAMIDA
Yoshihisa OKABUCHI
Takayuki Sugaya
Takahiro Saito
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MinebeaMitsumi Inc
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MinebeaMitsumi Inc
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Assigned to MINEBEA MITSUMI INC. reassignment MINEBEA MITSUMI INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KEBUKAWA, KOUJI, NOGAMIDA, WATARU, SUZUKI, KENTARO, OKABUCHI, YOSHIHISA, SAITO, TAKAHIRO, SUGAYA, Takayuki
Publication of US20230073481A1 publication Critical patent/US20230073481A1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/25—Devices for sensing temperature, or actuated thereby
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/06—Machines characterised by the presence of fail safe, back up, redundant or other similar emergency arrangements

Definitions

  • the present invention relates to a motor and a fan motor.
  • a technique of detecting defects of a bearing by detecting variation of frictional heat generated from the bearing by using a temperature sensor in rotating electrical machinery such as a motor and a generator is known.
  • An object of an aspect is to provide a motor and a fan motor capable of correctly detecting the temperature change of a bearing.
  • a motor includes a shaft, a rotor, a stator including a coil and opposed to the rotor, and a bearing configured to support the shaft.
  • the motor further includes a first temperature sensor disposed farther toward an outer periphery side than the coil, and a second temperature sensor disposed farther toward an inner periphery side than the coil.
  • the temperature change of the bearing can be more correctly detected.
  • FIG. 1 is a diagram illustrating an example of a fan motor of an embodiment.
  • FIG. 2 is an exploded perspective view illustrating an example of the fan motor of the embodiment.
  • FIG. 3 is a sectional view illustrating an example of the fan motor of the embodiment.
  • FIG. 4 is a bottom view illustrating an example of a motor with an impeller attached to the motor of the embodiment.
  • FIG. 5 is a bottom view illustrating an example of the fan motor of the embodiment.
  • FIG. 6 is a perspective view illustrating an example of a motor with a rotor yoke detached from the motor in the embodiment.
  • FIG. 7 is an enlarged sectional view illustrating an example of a fan motor of the embodiment.
  • FIG. 8 is a flowchart illustrating an example of an output process of the embodiment.
  • FIG. 9 is an enlarged sectional view illustrating an example of a fan motor of a first modification example.
  • FIG. 10 is a sectional view illustrating an example of a fan motor of a second modification example.
  • FIG. 11 is a bottom view illustrating an example of a fan motor of a third modification example.
  • FIG. 12 is a flowchart illustrating an example of an output process of a fourth modification example.
  • FIG. 1 is a diagram illustrating an example of a fan motor of the embodiment.
  • FIG. 2 is an exploded perspective view illustrating an example of the fan motor.
  • a fan motor 1 of the embodiment includes a housing 10 , an impeller 20 , and the motor 30 .
  • the fan motor 1 is used as a fan motor for a server, for example.
  • the housing 10 and the impeller 20 are formed of a metal such as resin or aluminum, for example.
  • the impeller 20 and the motor 30 are housed into the housing 10 from the Z-axis positive direction side. Note that in FIG. 1 , the motor 30 is covered with the impeller 20 and is not visible.
  • the housing 10 includes a bottom surface 11 , a plurality of stationary blades 12 , and a side wall 19 .
  • the side wall 19 is formed approximately parallel to the Z-axis direction.
  • the plurality of stationary blades 12 are located on the lower side in the axial direction, and extend in the radial direction with the bottom surface 11 as the center.
  • the impeller 20 includes a hub 21 and a plurality of rotor blades 22 . As illustrated in FIG. 2 , the impeller 20 is mounted at the motor 30 from the Z-axis direction positive direction side, and turns in conjunction with the motor 30 with the Z axis as the rotation axis.
  • the motor 30 is, for example, an outer rotor type motor. As illustrated in FIG. 3 , a rotor yoke 39 of the motor 30 turns a shaft 93 supported by bearings 91 and 92 as the rotation axis.
  • FIG. 3 is a sectional view illustrating an example of the fan motor of the embodiment. FIG. 3 illustrates a cross section taken along a plane 51 of FIG. 1 .
  • the motor 30 includes a stator 40 , a magnet 38 , the rotor yoke 39 , and a substrate 50 .
  • the rotor yoke 39 of the embodiment is formed in a cup shape covering the stator 40 from the Z-axis positive direction side.
  • the motor 30 further includes the bearings 91 and 92 , the shaft 93 , and a bearing liner 94 .
  • the rotor yoke 39 is an example of the rotor
  • the bearing liner 94 is an example of the holding member.
  • the stator 40 includes a stator core 41 , insulators 42 and 43 , and a coil 44 .
  • the stator core 41 is formed by stacking a plurality of plate-shaped metal members such as silicon steel sheets and soft magnetic steel sheets such as electromagnetic steel sheets in the Z-axis direction, for example.
  • the insulators 42 and 43 are formed of an insulator such as a resin, for example.
  • the insulators 42 and 43 are mounted to the stator core 41 from the positive direction side and the negative direction side in the Z-axis direction, respectively.
  • the coil 44 is wound around the stator core 41 through the insulators 42 and 43 .
  • the insulators 42 and 43 may be a coating with electrical insulation.
  • the rotor yoke 39 is coupled to the upper end of the shaft 93 through a boss part 37 , for example. In this case, the shaft 93 turns in conjunction with the rotor yoke 39 .
  • the magnet 38 is fixed to the inner periphery side of the rotor yoke 39 .
  • the magnet 38 and the rotor yoke 39 , and the stator 40 are opposed to each other in the radial direction.
  • the rotor yoke 39 is formed of a metal such as iron.
  • the rotor yoke 39 need not be a cup-shaped integrated component, and a member coupled with the upper end of the shaft 93 and a member disposed at the outer periphery of the magnet 38 may be separate members.
  • An electronic component for performing control and power feeding of the motor 30 , and the like are disposed at the substrate 50 .
  • the substrate 50 is formed of a resin, for example.
  • the electronic component includes an integrated circuit (IC), not illustrated in the drawing, that acquires detection results output from temperature sensors 61 , 62 and 63 described later, and the like, for example.
  • IC integrated circuit
  • the bearings 91 and 92 are ball bearings, and support the shaft 93 in the radial direction, for example. Note that in the following description, the bearings 91 and 92 may be simply referred to as a bearing 90 for collective description, and may be referred to as the first bearing 91 and the second bearing 92 for differentiation.
  • the bearing liner 94 supports the shaft 93 through the bearings 91 and 92 .
  • the bearing liner 94 is inserted in the Z-axis direction into the center portion of the stator 40 in the radial direction, for example.
  • the bearing liner 94 is formed of a metal such as brass, for example.
  • the motor 30 of the embodiment includes a temperature sensor to detect defects of the bearing 90 .
  • the motor 30 of the embodiment includes a plurality of the temperature sensors 61 , 62 and 63 .
  • the plurality of the temperature sensors 61 , 62 and 63 may be simply referred to as the temperature sensor 60 for collective description, and may be referred to as the first temperature sensor 61 , the second temperature sensor 62 , and the third temperature sensor 63 for differentiation.
  • Each of the first temperature sensor 61 , the second temperature sensor 62 , and the third temperature sensor 63 outputs a detected temperature to a motor controlling IC described later and not illustrated in the drawing.
  • FIG. 4 is a bottom view illustrating an example of a motor with an impeller attached to the motor of the embodiment.
  • FIG. 5 is a bottom view illustrating an example of the fan motor of the embodiment.
  • FIG. 6 is a perspective view illustrating an example of a motor with a rotor yoke detached from the motor in the embodiment.
  • FIG. 7 is an enlarged sectional view illustrating an example of the fan motor of the embodiment.
  • FIG. 7 is an enlarged view of a portion illustrated in a frame F 1 in FIG. 3 .
  • the first temperature sensor 61 is disposed farther toward the outer periphery side than the coil 44 in the radial direction, for example.
  • the second temperature sensor 62 is disposed farther toward the inner periphery side than the coil 44 in the radial direction, for example.
  • the first temperature sensor 61 is disposed at the substrate 50 (e.g., a first member), for example. Specifically, at least the substrate 50 made of resin is interposed between the first temperature sensor 61 and the bearings 91 and 92 . In addition, the distance between the first temperature sensor 61 and the coil 44 is smaller than the distance between the first temperature sensor 61 and the bearings 91 and 92 .
  • the second temperature sensor 62 is disposed at the bearing liner 94 (e.g., a second member) in the embodiment.
  • the second temperature sensor 62 is disposed at the Z-axis direction positive direction side of the bearing liner 94 , e.g., at a position opposed to the first bearing 91 in the radial direction. More specifically, the second temperature sensor 62 is opposed to the first bearing 91 through the bearing liner 94 in the radial direction.
  • the third temperature sensor 63 is further disposed inside the motor 30 . Inside the motor 30 , the third temperature sensor 63 is disposed in contact with any of the members. For example, the third temperature sensor 63 is disposed at the Z-axis direction negative direction side and on the inner periphery side of the bearing liner 94 as illustrated in FIG. 5 . Note that in FIG. 5 , the first temperature sensor 61 and the second temperature sensor 62 are not visible. Note that the third temperature sensor 63 need not be disposed at the position described in the example, as long as the third temperature sensor 63 is disposed inside the motor.
  • a shortest distance D 1 between the first temperature sensor 61 and the closer one of the bearings 91 and 92 is greater than a shortest distance D 2 between the second temperature sensor 62 and the closer one of the bearings 91 and 92 , and is greater than a shortest distance D 3 between the third temperature sensor 63 and the closer one of the bearings 91 and 92 .
  • a shortest distance D 5 between the third temperature sensor 63 and the stator 40 is greater than a shortest distance D 4 between the second temperature sensor 62 and the stator 40 .
  • the resin making up the substrate 50 formed with the first temperature sensor 61 , and the bearing liner 94 made of metal disposed with the second temperature sensor 62 and the third temperature sensor 63 are different from each other in terms of thermal capacity and thermal conductivity.
  • the thermal conductivity of the substrate 50 is smaller than 1 (W/mK), while the thermal conductivity of the bearing liner 94 is 10 (W/mK) or greater.
  • the motor controlling IC disposed with the substrate 50 may include three temperature sensor terminals.
  • the first temperature sensor 61 , the second temperature sensor 62 , and the third temperature sensor 63 are directly connected to the same motor controlling IC without interposing other members such as a resistor.
  • the second temperature sensor 62 and the third temperature sensor 63 disposed separately from the substrate 50 are connected to the motor controlling IC through a wiring line 64 and a wiring line 65 , respectively.
  • the wiring line 64 is passed through a gap of teeth protruding in the radial direction in the stator core 41
  • the wiring line 65 is passed through a hole 51 formed at the substrate 50 as illustrated in FIGS. 3 and 6 , for example.
  • the temperature sensor 60 detects the temperature rise due to the friction, and thus the defect of the bearing 90 can be detected.
  • the temperature sensor 60 also detects heat generated at the coil 44 . As such, it may be difficult to identify whether a temperature rise is due to heat generated by the coil 44 or a defect of the bearing 90 . For example, when a defect is caused at only one bearing, the temperature increases only at the periphery of the bearing, and therefore it is relatively easy to detect the defect. When defects are simultaneously caused at both the first bearing 91 and the second bearing 92 , the temperature increases simultaneously at both the bearings 91 and 92 , and therefore it is more difficult to detect the defects.
  • the first temperature sensor 61 disposed at a position close to the coil 44 and the second temperature sensor 62 disposed at a position close to the bearing 91 or 92 are provided.
  • a temperature change of the bearing 91 or 92 can be correctly detected on the basis of a detection result of the first temperature sensor 61 strongly influenced by the temperature change of the coil 44 and a detection result of the second temperature sensor 62 influenced by the temperature change of the bearing 91 or 92 in addition to the temperature change of the coil 44 even in the case where defects are simultaneously generated at the first bearing 91 and the second bearing 92 , for example.
  • a processing section of the motor controlling IC directly connected to the first temperature sensor 61 , the second temperature sensor 62 and the third temperature sensor 63 outputs an output signal to the outside of the motor on the basis of the detection result of the first temperature sensor 61 and the detection result of the second temperature sensor 62 , for example.
  • the process of outputting the signal on the basis of the temperature change is described with reference to FIG. 8 .
  • FIG. 8 is a flowchart illustrating an example of an output process of the embodiment. As illustrated in FIG. 8 , the processing section not illustrated in the drawing acquires a detection result T 1 output from the first temperature sensor 61 and a detection result T 2 output from the second temperature sensor 62 (step S 11 ).
  • the processing section calculates a difference T 2 -T 1 between the acquired detection result T 2 and detection result T 1 . Then, whether the calculated difference T 2 -T 1 is greater than threshold value Ta is determined (step S 21 ).
  • step S 21 When the difference T 2 -T 1 is determined to be smaller than a threshold value Ta (step S 21 , No), the processing section returns to step S 11 , and continues the acquisition of the detection results T 1 and T 2 . On the other hand, when the difference T 2 -T 1 is determined to be greater than the threshold value Ta (step S 21 , Yes), the processing section outputs an alert to an external apparatus (step S 22 ).
  • the processing section may further acquire a detection result T 3 output from the third temperature sensor 63 in addition to the detection results T 1 and T 2 .
  • the processing section may compare, with the threshold value Ta, the larger one of a difference T 3 -T 1 between the detection results T 1 and T 3 and the difference T 2 -T 1 , for example.
  • the motor 30 of the embodiment includes the shaft 93 , a rotor yoke 39 , the coil 44 , the stator 40 opposed to the rotor yoke 39 , and the bearing 91 supporting the shaft 93 .
  • the motor 30 includes the first temperature sensor 61 disposed farther toward the outer periphery side than the coil 44 , and the second temperature sensor 62 disposed farther toward the inner periphery side than the coil 44 .
  • the embodiment is not limited to this.
  • the number of the bearings for supporting the shaft 93 is not limited to two, and may be one, or three or more.
  • FIG. 9 is an enlarged sectional view illustrating an example of a fan motor of the first modification example.
  • a fan motor 2 of the first modification example includes the first temperature sensor 61 and the second temperature sensor 62 , but does not include the third temperature sensor 63 .
  • the temperature sensor may be provided only at one of a portion near the first bearing 91 or a portion near the second bearing 92 in the Z-axis direction. In this case, the third temperature sensor 63 may be omitted.
  • each temperature sensor is not limited to the position described in the embodiment.
  • the first temperature sensor is disposed at the surface (lower side surface) of the substrate 50 on the negative direction side in the Z-axis direction, but the present invention is not limited to this, and the first temperature sensor may be disposed at the surface (upper side surface) on the opposite side of the substrate 50 as illustrated in FIG. 10 .
  • FIG. 10 is a sectional view illustrating an example of a fan motor of a second modification example.
  • FIG. 10 illustrates a cross section taken along a plane S 2 of FIG. 1 .
  • the second temperature sensor 72 is disposed at an intermediate position between the first bearing 91 and the second bearing 92 in the Z-axis direction.
  • the temperature sensor when disposed separately from the substrate 50 , the temperature sensor preferably transmits sensor information in a wireless manner in order to avoid complicated wiring.
  • the second temperature sensor 72 may be disposed at the inner periphery side or the outer periphery side of the bearing liner 94 .
  • the second temperature sensor 72 may be disposed in contact with the bearing 90 as long as the second temperature sensor 72 is disposed at a position the temperature change of the bearing 90 can be determined.
  • the third temperature sensor 73 be disposed at any of the members of the motor, and may be disposed at an end portion of the bearing 90 in the axis direction and the like as illustrated in FIG. 10 , for example. Also in this case, the third temperature sensor 73 is connected to the motor controlling IC not illustrated in the drawing through a wiring line 75 passing through the hole 51 of the substrate 50 , for example.
  • FIG. 11 is a bottom view illustrating an example of a fan motor of a third modification example.
  • the second temperature sensor 82 and the third temperature sensor 83 disposed separately from each other in the Z-axis direction may be disposed at overlapping positions in plan view.
  • the first temperature sensor 61 , the second temperature sensor 82 and the third temperature sensor 83 may be disposed in substantially the same direction in the circumferential direction.
  • the processing section not illustrated in the drawing acquires the detection results T 1 and T 2 and outputs an alert based on the calculated result of the difference T 2 -T 1 , but the embodiment is not limited to this.
  • the processing section may output the difference T 2 -T 1 as is without determining whether to output the alert.
  • FIG. 12 is a flowchart illustrating an example of an output process of a fourth modification example.
  • the processing section of the fourth modification example not illustrated in the drawing calculates the difference T 2 -T 1 between the acquired detection result T 2 and detection result T 1 . Then, the processing section outputs the calculated difference T 2 -T 1 to an external apparatus as is (step S 31 ).
  • the processing section need not store the threshold value Ta, and thus the configuration of the motor can be simplified.
  • the motor 30 may output the detection results T 1 and T 2 as is to the outside without calculating the difference T 2 -T 1 .
  • the processing section for calculating the difference T 2 -T 1 of the detection result need not be disposed at the motor, and thus the configuration of the motor can be further simplified.
  • the embodiment is not limited to this.
  • the first bearing 91 and the second bearing 92 may be held at respective holding members.
  • the plurality of holding members be composed of the same material and in contact with each other.
  • the holding member may be formed of iron or another material other than brass as long as the holding member is composed of a material with high thermal conductivity.
  • another resin component other than the substrate 50 may be interposed between the first temperature sensor 61 and the bearing 91 or 92 .
  • the second temperature sensor 62 and the third temperature sensor 73 may be in direct contact with the bearing 91 .
  • the part the motor 30 is mounted is not limited to the fan motor 1 , and the motor 30 may be mounted at other external apparatuses. Further, the temperature sensor described in the embodiment and the modification examples may be mounted at other rotating electrical machinery such as a generator instead of a motor.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Motor Or Generator Frames (AREA)
US17/812,528 2021-09-07 2022-07-14 Motor and fan motor Active US11962202B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021145727A JP2023038818A (ja) 2021-09-07 2021-09-07 モータ及びファンモータ
JP2021-145727 2021-09-07

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US20230073481A1 US20230073481A1 (en) 2023-03-09
US11962202B2 true US11962202B2 (en) 2024-04-16

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US17/812,528 Active US11962202B2 (en) 2021-09-07 2022-07-14 Motor and fan motor

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US (1) US11962202B2 (fr)
EP (1) EP4145687A1 (fr)
JP (1) JP2023038818A (fr)
CN (1) CN115776195A (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10049506A1 (de) 1999-10-12 2001-04-19 Csi Technology Inc Integrierte Elektromotorüberwachung
US6617713B1 (en) 2002-10-07 2003-09-09 Hsu-Chuan Li Stagnant rotating prevention and safety control device for a main shaft
DE10305368A1 (de) 2003-02-10 2004-08-19 Siemens Ag Elektrische Maschine mit Temperaturüberwachung
JP2015231295A (ja) 2014-06-05 2015-12-21 株式会社日立製作所 軸受故障予兆診断装置、軸受故障予兆診断システム、及び軸受故障予兆診断方法
JP2020133889A (ja) 2019-02-12 2020-08-31 Ntn株式会社 軸受装置およびスピンドル装置

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Publication number Priority date Publication date Assignee Title
JPH0370448A (ja) * 1989-08-09 1991-03-26 Hitachi Koki Co Ltd 遠心機駆動装置の冷却制御方式
JP2005073333A (ja) * 2003-08-21 2005-03-17 Yaskawa Electric Corp Ａｃサーボモータおよびこれを用いた減速機一体形アクチュエータならびにロボット装置
JP7210331B2 (ja) * 2019-03-04 2023-01-23 ミネベアミツミ株式会社 モータユニットおよびファン
JP7335803B2 (ja) * 2019-12-12 2023-08-30 ミネベアミツミ株式会社 モータ、及び、モータの状態判定装置

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Publication number Priority date Publication date Assignee Title
DE10049506A1 (de) 1999-10-12 2001-04-19 Csi Technology Inc Integrierte Elektromotorüberwachung
US6529135B1 (en) 1999-10-12 2003-03-04 Csi Technology, Inc. Integrated electric motor monitor
US6617713B1 (en) 2002-10-07 2003-09-09 Hsu-Chuan Li Stagnant rotating prevention and safety control device for a main shaft
DE10305368A1 (de) 2003-02-10 2004-08-19 Siemens Ag Elektrische Maschine mit Temperaturüberwachung
US20060017336A1 (en) * 2003-02-10 2006-01-26 Siemens Aktiengesellschaft Electric machine with improved temperature monitoring system
US7339295B2 (en) 2003-02-10 2008-03-04 Siemens Aktiengesellschaft Electric machine with improved temperature monitoring system
JP2015231295A (ja) 2014-06-05 2015-12-21 株式会社日立製作所 軸受故障予兆診断装置、軸受故障予兆診断システム、及び軸受故障予兆診断方法
JP2020133889A (ja) 2019-02-12 2020-08-31 Ntn株式会社 軸受装置およびスピンドル装置

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Extended European Search Report dated Feb. 1, 2023 for corresponding European Application No. EP22193605.7.

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JP2023038818A (ja) 2023-03-17
US20230073481A1 (en) 2023-03-09
CN115776195A (zh) 2023-03-10
EP4145687A1 (fr) 2023-03-08

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